Atari 1200XL (Revision 2 Prototype)  






A300 Project

(Pre-1200 Designs)











The Atari 1200XL (Revision 2)

This appears to be a 2nd revision of the Atari 1200XL design, not an early design.  It may have also been a possible design concept for the 1400XL computer.  The Atari 1200XL was shown to the public in December 1982 and began manufacturing Domestically in the US with shipments starting in February 1983.   In March of 1983 the specifications for the Atari 600XL and shortly afterwards the 800XL were written up.  By June of 1983 the specifications for the Atari 1400XL and 1450XLD were also written up.   By July of 1983 the Atari 1200XL was discontinued with the expectation that by fall of 1983 the "New" XL's would be taking it's place, all with expansion capabilities and other features.    


The left side of this 2nd revision 1200XL lacks the side cartridge slot and instead has it relocated to the top of the chassis in the same fashion that the 600XL and 800XL computers were designed.  The joystick ports are flush and not at a right angle, this would be carried over into the 1400XL and 1450XLD computers as well.   Only a side on/off switch is still located in the same position.  The 45 degree joystick ports, while being actually very convenient for the end users and adding a nice style to the case design, caused difficulties during assembly and placement of the main board into the lower half of the case, so they were eliminated in future model designs.


The rear of the case is where the idea that this may have been a concept idea for an early 1400XL design.  Using the same cartridge placement as the 600XL and 800XL computers.  It is possible that Atari designers may have, shortly, contemplated doing the same for the 1400XL design.  The rear of the system is very close the layout of the product designed 1400XL computer.  On the expansion bay opening hasn't been finalized.  It would appear in this mock up, that Atari designers were going to consider using some kind of "keyed" plug in expansion cable.


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